If you are running into issues with Windows 10 20H2, this guide will explain how to uninstall and roll back to a previous version of Windows. If you upgraded to Windows 10 from Windows 10 1909 or older, then a full update was used to install the new operating system. If a user was running Windows 10 2004, the Windows 10 feature update will be installed via an ‘enablement package’ that turns on features already part of the operating system but are turned off. Uninstalling the KB4562830 update can only be rolled back within 10 days of being installed.
Source: https://www.bleepingcomputer.com/news/microsoft/how-to-uninstall-and-downgrade-windows-10-20h2-to-previous-versions/